if it is oil it will burn in a powerstroke    and i mean a powerstroke  sry sick .0  an sick .4  guys  these junk engines wont like it . The  1999 7.3 f-350 i have will run on pure filtered waste motor oil. ( no cutting with diesel as long as the temp is above 50 degrees outside)  In the winter i run a 50 %  mix .  i have  burned prolly 800 gals of pure waste engine oil  since i started  about this time last year  and prolly  1000  gals of mix. no problems yet .  if u run pure wmo u will get some blue smoke until u reach normal engine operating temp  but hey its free fuel !  it will also get beter mileage 2 the tune of 25-35 %  with a slight increase in power and reduction of engine noise .    i do not think the tax department would b 2 proud of this tho .   it can b done just dont get caught !